Furnace-arch.



G. E. MAXLOW & A. VAN VLIET.

FURNACE AROH.

APPLICATION TILED MAR.25,1911.

Patented Oct. 17, 1911.

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GEORGE E. MAXLO'W AND ABTIFYUR VAN VLIET, OF DETROIT,

ONE-HALF 'lO DETROIT STOKER COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN.

MICHIGAN, ASSIGNOBS OF FUlt'tNACE-ARCH.

To all whom it may concern:

Be it known that we, Gnouon E. lllaxnow,

a subject of the King of Great Britain,

and Airrnuu VA): Vinicr, a citizen of the United States, and residents of Detroit, in the county of Wayne and State of lVliehi; gan, have invi' fed a new and useful l urnacc-Arch, of which the following is a specification.

The invention relates to an ilnprovtanent in steam boiler furnaces, and more particularly that type of furnace wherein the fuel is fed from the sides of the TIUFDRCO onto the inclined grate bars. In this type of furnace, the fuel is usually stored in magazines at the side and the coking thereof takes place adjacent the upper end of the gate bars. In such furnaces, it. has been ascertained that in connection with the interior arch of the furnace, there is more or less variation, owing' to heat coiulitiions, especially at the abutments. These abutments have in the past been supported on the magazine wall and when the abutments became warped or cracked, owing to expansion and to the action of the heat, it has been necessary to remove the entire all of the magazine and replace t same.

The present invention has for its object the placement in the furnace of a removable arch abutment in the form of a metal member and to place and support between the member and the interior of the furnacc, a removable protective member, the latter being held. adjacent to the mouth of the magazine. The protective inci'ubers being located as stated, are naturally affected by the heat and become distorted or burned out, however the same can be read} ily replaced or removed without the neces sity of removing or dis ')lacing the arch support or abutment. By the cm'istruction also, the magazine wall is protected and prevented from warping or cracking while the arch has freedom of expansion 1ongitudinally of the furnace without interfering with the supporting parts which supporting parts are protected by independently removable members.

We have shown in the accompanying drawing, an embodiment of the invention, but desire it understood that changes can be made without departing from the nature and principle thereof.

In the accompanying drawings, Figure 1 Specification of Letters Patent. Application filed March 25. 1911. Serial No. 616,895.

Llatented Oct. 1'7, 2911.

is a. view ol. the interior of a furnace showing the improved arch construction. Fig. 2. shows a retaining; device for the ha r showh in Fig. l. l ig. 2-5 is a pcrspm'tivc ol a refructory block. Fig. -l is a view of a supporting bar.

Sii'nilar reference characters refer to like parts throughout the several views.

The construction shown in Fig. l is that o'l' a. ltl nrphy furnace and stoluu: having an outer arch l, spouts 2 l'or the coal, feeder shafts 3, segments t to move the pushcrs Ii, ,c'ratc bars (1, and end wall T. This construction has long been in usv and forms no part oi our present invention. The fuel is fed into the spouts 2 and slides down the inclined sides 8 by gravity. The pushcrs move laterally, from the positipns shown in Fig, inwardly, pushing: the fuel before them onto the grate bars 0, down which it slowly slides. The result. is a. coking of the coal and a burning ot the gases adjacent the s n-innings ot' the interior arch 10,

which is built in to save the outer arch 1,

and usually of tire brick.

While any desired means may be cin ployed to sustain the supporting arch abutment bar 11 which extend lengthwiseof the furnace, the construction shown in the drawing is preferred .i'or the type of furnace shown. The tront plates 12 of the spouts 2 may be provided withtlanges 13, properly reinforced, to which flanges are connected the blocks it having jaws 15. The bars 11 are crossshapcd in section and have tongues 16 adapted to extend between the jaws 15, bolts extending through holes in the jaws to secure the bars in position. The number of these blocks l-t will depend upon the Weight to be ca ried and the proportions of the parts.

The line of blocks 18 of each springing will be formed with a groove to receive one rib 19 on the bar 11. Angled plates 20 will extend inwardly as shown in. the drawing and support the refractory blocks 21 having grooves for the supporting abutment bars. These blocks have tongues 22 which test on the plates 20. The air which may enter at the end of the furnace through openings 23,

passes along between the arches 1 and 10 and then down and through the spaces between the tongues 22 of the blocks 21. The air meets the hot gases formed by coking thecoal on the grate bars, and the burning of .means of abutment bars which are completely protected, the crumbling of the lower lines of bricks will not rob the arch of its support. Sudden collapse is therefore avoided,- for Lhe line of blocks 21 can be easily replaced without tearing down the arch and may therefore be renewed whenever deterioration is found.

Having now explained our construction,

what we claim as our invention and desire to secure by Letters Patent is V 1. In a furnace arch construction, in combination with the side walls, of an inwardly projecting bar at each springing of the arch extending: parallel to the line of the arch, said bar having ribs, an arch of refractory blocks supported by said bars, the lower lines of the blocks at the springings having grooves to receive said ribs, and plates supported by the walls to carry the lowest lines of blocks. v

2. In a furnace arch construction, in co1nbination with the side walls, of an inwardly projecting bar at each springing of the arch extending parallel to the line of the arch, said bar having ribs, an arch of refractory blocks supported by said bars, the lower lines of the blocks at the springings having grooves to receive, said ribs, and plates sup ported by the walls. to carry the lowest lines of blocks, said blocks having transverse grooves to permit air to pass across the 1nner faces of said plates.

3. In a furnace arch construction, in combination with the side walls, of inwardly projecting longitudinally ribbed bars at the springings of the arch, which bars extend parallel to the line of the arch, means secured to said walls to carry said bars, grooved blocks resting on said bars, an arch of blocks extending between said grooved bars and carried thereby, a line of blocks extending along beneath each bar and having transverse grooves in their lower faces, and means to hold said blocks in position.

4. In a furnace arch construction, the combination with the side walls and a horizontal longitudinally-extending plate connected to each wall, of a series of blocks secured to said plate and having jaws, an inwardly and downwardly extending bar carried by said jaws at each springing. of

the arch and extending parallel to the line of the arch, said bar having ribs, an arch of refractory blocks supported bysaid bars,

a line of blocks extending along the lower 

